chore(deps)(deps): bump @angular/common in /frontend (#22)

Bumps [@angular/common](https://github.com/angular/angular/tree/HEAD/packages/common) from 20.3.10 to 20.3.12.
- [Release notes](https://github.com/angular/angular/releases)
- [Changelog](https://github.com/angular/angular/blob/main/CHANGELOG.md)
- [Commits](https://github.com/angular/angular/commits/20.3.12/packages/common)

---
updated-dependencies:
- dependency-name: "@angular/common"
  dependency-version: 20.3.12
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

frontend/package-lock.json

@@ -31,7 +31,7 @@
   "dependencies": {
     "@angular/animations": "^20.3.12",
     "@angular/cdk": "^20.2.12",
-    "@angular/common": "^20.3.10",
+    "@angular/common": "^20.3.12",
     "@angular/compiler": "^20.3.12",
     "@angular/core": "^20.3.10",
     "@angular/forms": "^20.3.10",